;(function flexible(window, document) {
  const docEl = document.documentElement
  const dpr = window.devicePixelRatio || 1
  const baseSize = 100

  // adjust body font size
  // function setBodyFontSize () {
  //     if (document.body) {
  //         document.body.style.fontSize = (12 * dpr) + 'px'
  //     } else {
  //         document.addEventListener('DOMContentLoaded', setBodyFontSize)
  //     }
  // }
  // setBodyFontSize()

  // set 1rem = viewWidth / 10
  function setRemUnit() {
    // 当前页面宽度相对于 1920 宽的缩放比例，可根据自己需要修改。
    let scale = document.documentElement.clientWidth / 1920
    // 最小1200
    if (scale <= 0.625) {
      scale = 0.625
    }
    // 设置页面根节点字体大小
    const resultScale = baseSize * Math.min(scale, 0.95)
    docEl.style.fontSize = resultScale + 'px !important'
  }

  setRemUnit()

  // reset rem unit on page resize
  window.addEventListener('resize', setRemUnit)
  window.addEventListener('pageshow', function (e) {
    if (e.persisted) {
      setRemUnit()
    }
  })

  // detect 0.5px supports
  if (dpr >= 2) {
    const fakeBody = document.createElement('body')
    const testElement = document.createElement('div')
    testElement.style.border = '.5px solid transparent'
    fakeBody.appendChild(testElement)
    docEl.appendChild(fakeBody)
    if (testElement.offsetHeight === 1) {
      docEl.classList.add('hairlines')
    }
    docEl.removeChild(fakeBody)
  }
})(window, document)
